[PATCH 2/2] remoteproc: qcom_q6v5_mss: map/unmap MBA region before/after use

[Sibi Sankar]

The application processor accessing the MBA region after assigning it to
the remote Q6 would lead to an XPU violation. Fix this by un-mapping the
MBA region post firmware copy and MBA text log dumps.

Signed-off-by: Sibi Sankar <si...@codeaurora.org>
---
 drivers/remoteproc/qcom_q6v5_mss.c | 37 ++++++++++++++++++++++---------------
 1 file changed, 22 insertions(+), 15 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c 
b/drivers/remoteproc/qcom_q6v5_mss.c
index 2c866b6da23c..1b4a34325788 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -189,7 +189,6 @@ struct q6v5 {
        size_t total_dump_size;
 
        phys_addr_t mba_phys;
-       void *mba_region;
        size_t mba_size;
        size_t dp_size;
 
@@ -408,7 +407,7 @@ static int q6v5_xfer_mem_ownership(struct q6v5 *qproc, int 
*current_perm,
                                   current_perm, next, perms);
 }
 
-static void q6v5_debug_policy_load(struct q6v5 *qproc)
+static void q6v5_debug_policy_load(struct q6v5 *qproc, void *ptr)
 {
        const struct firmware *dp_fw;
 
@@ -416,7 +415,7 @@ static void q6v5_debug_policy_load(struct q6v5 *qproc)
                return;
 
        if (SZ_1M + dp_fw->size <= qproc->mba_size) {
-               memcpy(qproc->mba_region + SZ_1M, dp_fw->data, dp_fw->size);
+               memcpy(ptr + SZ_1M, dp_fw->data, dp_fw->size);
                qproc->dp_size = dp_fw->size;
        }
 
@@ -426,6 +425,7 @@ static void q6v5_debug_policy_load(struct q6v5 *qproc)
 static int q6v5_load(struct rproc *rproc, const struct firmware *fw)
 {
        struct q6v5 *qproc = rproc->priv;
+       void *ptr;
 
        /* MBA is restricted to a maximum size of 1M */
        if (fw->size > qproc->mba_size || fw->size > SZ_1M) {
@@ -433,8 +433,16 @@ static int q6v5_load(struct rproc *rproc, const struct 
firmware *fw)
                return -EINVAL;
        }
 
-       memcpy(qproc->mba_region, fw->data, fw->size);
-       q6v5_debug_policy_load(qproc);
+       ptr = memremap(qproc->mba_phys, qproc->mba_size, MEMREMAP_WC);
+       if (!ptr) {
+               dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n",
+                       &qproc->mba_phys, qproc->mba_size);
+               return -EBUSY;
+       }
+
+       memcpy(ptr, fw->data, fw->size);
+       q6v5_debug_policy_load(qproc, ptr);
+       memunmap(ptr);
 
        return 0;
 }
@@ -541,6 +549,7 @@ static void q6v5_dump_mba_logs(struct q6v5 *qproc)
 {
        struct rproc *rproc = qproc->rproc;
        void *data;
+       void *ptr;
 
        if (!qproc->has_mba_logs)
                return;
@@ -549,12 +558,16 @@ static void q6v5_dump_mba_logs(struct q6v5 *qproc)
                                    qproc->mba_size))
                return;
 
-       data = vmalloc(MBA_LOG_SIZE);
-       if (!data)
+       ptr = memremap(qproc->mba_phys, qproc->mba_size, MEMREMAP_WC);
+       if (!ptr)
                return;
 
-       memcpy(data, qproc->mba_region, MBA_LOG_SIZE);
-       dev_coredumpv(&rproc->dev, data, MBA_LOG_SIZE, GFP_KERNEL);
+       data = vmalloc(MBA_LOG_SIZE);
+       if (data) {
+               memcpy(data, ptr, MBA_LOG_SIZE);
+               dev_coredumpv(&rproc->dev, data, MBA_LOG_SIZE, GFP_KERNEL);
+       }
+       memunmap(ptr);
 }
 
 static int q6v5proc_reset(struct q6v5 *qproc)
@@ -1605,12 +1618,6 @@ static int q6v5_alloc_memory_region(struct q6v5 *qproc)
 
        qproc->mba_phys = r.start;
        qproc->mba_size = resource_size(&r);
-       qproc->mba_region = devm_ioremap_wc(qproc->dev, qproc->mba_phys, 
qproc->mba_size);
-       if (!qproc->mba_region) {
-               dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n",
-                       &r.start, qproc->mba_size);
-               return -EBUSY;
-       }
 
        if (!child) {
                node = of_parse_phandle(qproc->dev->of_node,
-- 
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